Technical data

SED2 Operation & Maintenance Manual Addendum
140 Siemens Building Technologies, Inc.
Hibernation Mode
If the SED2 reaches the hibernation setpoint in PID operating mode, the P2391 hibernation timer
starts. After the timer expires, the SED2 drives the output frequency of the ramp to 0 Hz.
T1 Hibernation frequency
reached.
Start of hibernation timer.
T2 Minimum output
frequency reached.
T3 Output frequency
decreased according to
the set ramp.
PID control of the output
frequency is interrupted.
T4 Output frequency = zero
(motor standstill).
T3
to
T5
The PID fault signal [%]
is monitored.
NOTES:
Observe polarity of the
PID fault signal.
Polarity of the PID fault
signal must match the
sequence of the
controlled functions
(cooling/heating or vice-
versa).
The temperature setpoint
can be below 0°C.
The PID fault signal can
be positive or negative.
T5 SED2 output frequency is
again increased.
PID control of the output
frequency is again
enabled.
f
0%
T1 T2 T3 T4 T5
Output [Hz ]
P2392 Restart freq.
P2390 Hibernation freq.
Min. freq.
P2391
Hibernation timer
Hibernation
mode
Restart
Drive frequency
PID frequency
max.
hibernation
(-) error [%]
Time [s]
Time [s]
5192D06en
PID error [% ]
Figure 12. Hibernation Mode.
Parameter Settings for Hibernation Mode (commissioning)
P2390, Hibernation frequency
Hibernation frequency setpoint (frequency that the motor output will turn off).
Setting range: 0 to 200%
Recommended setting: Value 15 to 20% greater than the minimum frequency.
The hibernation function is disabled if the hibernation frequency is set to 0 (factory setting).
P2391, Hibernation timer
Set the desired time T1 to T3, before hibernation mode starts (see Figure 12).